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A Novel Frequency Compensation Technique in Three Stage Amplifiers with Active Feedback

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Author(s): Majid Jalalifar | Mohammad Yavari | Farshid Raissi

Journal: Majlesi Journal of Electrical Engineering
ISSN 2008-1413

Volume: 4;
Issue: 1;
Start page: 7;
Date: 2010;
Original page

Keywords: CMOS multistage amplifiers | Nested Miller compensation | active capacitive feedback

ABSTRACT
This paper presents a dual-active capacitance in reversed nested Miller compensation (DACRNMC) technique for low-voltage and large capacitive load amplifiers. The frequency bandwidth of the DACRNMC amplifier has been improved due to the usage of active compensation capacitors. The amplifier's die area is reduced in compare to the existing techniques in the RNMC scheme. The architecture also generates two left half plane zeros to increase the phase margin. The simulation for the proposed DACRNMC amplifier with a 0.18┬Ám standard CMOS process reveals a unity gain bandwidth of 17.4MHz and phase margin of 64 degrees , while 500 pF load is driven from a single 1.5V power supply.
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